Arsene Wenger believes Arsenal's defeat to Manchester United a fortnight ago is still having an adverse affect on his players.
The Gunners were beaten 3-1 by Jose Mourinho's side on December 2 and have gone on to draw their next two Premier League outings away at Southampton and West Ham.
Taking just two points out of a possible nine has left Arsenal down in seventh place heading into Saturday's visit of struggling Newcastle.
But Wenger feels there may still be a hangover from the way his side lost to United, who struck twice early on and had goalkeeper David De Gea to thank for making a number of quality saves.
"It still plays on their minds," he said when asked about the United defeat.
"You need to get that out of the system. When you have so many chances as we had and you come out with nothing, it's difficult to swallow and it takes a little while.
"I think the best way is to continue to put that behind us and focus on the quality of our game."
While De Gea's man of the match display helped keep Arsenal at bay for much of the contest, Wenger's forwards have been misfiring of late.
Arsenal have created more chances than any other team in the Premier League this season but have only managed to convert 13 per cent of them, while both United and leaders Manchester City boast a 23 per cent conversion rate.
Across the three games against United, Southampton and West Ham, Wenger saw his side have 66 shots on goal but only Alexandre Lacazette's consolation against the Red Devils and Olivier Giroud's late equaliser at Saints found the back of the net.
"At the moment there is a difference between points we get and the domination we have in the game," the Arsenal boss added.
"Of course it is down to the fact that we've played recently against two teams who defended extremely well at home. West Ham have shown that against City and against Chelsea.
"Maybe we have to speed up our passing and have more penetrating runs in the final third to create more chances. Maybe we need support for our central strikers in the box as well."